Article
Astronomy & Astrophysics
K. Arnswald, A. Blazhev, F. Nowacki, P. Petkov, P. Reiter, T. Braunroth, A. Dewald, M. Droste, C. Fransen, R. Hirsch, V. Karayonchev, L. Kaya, L. Lewandowski, C. Mueller-Gatermann, M. Seidlitz, B. Siebeck, A. Vogt, D. Werner, K. O. Zell
Summary: Lifetime measurements of excited states in doubly-magic Ni-56 were conducted to determine reduced transition probabilities, showing high E2 strength and collectivity. Comparisons with different calculation methods were made, indicating a possible similar collective behavior in the 6(1)(+) state of Sn-100.
Article
Instruments & Instrumentation
M. Beckers, A. Dewald, C. Fransen, L. Kornwebel, C. -D. Lakenbrink, F. von Spee
Summary: Uncertainties in absolute plunger distances are often overlooked in measurements with the RDDS method. This paper explains how these uncertainties arise when using the capacitance method to determine absolute distances and discusses their impact on the results of plunger experiments. Additionally, a new approach using a high precision optical distance probe to obtain absolute foil separations for plunger measurements is introduced, which significantly reduces these uncertainties.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Astronomy & Astrophysics
M. Sambataro, N. Sandulescu
Summary: This article provides a description of deformed N = Z nuclei using a formalism of alpha-like quartets. Quartets are constructed by variationally resorting to the use of proper intrinsic states. Different types of intrinsic states are introduced, which generate different sets of quartets for a given nucleus. Energy spectra are generated through configuration-interaction calculations in the spaces built with these quartets. The approach has been successfully applied to 24Mg, 28Si, and 48Cr nuclei, achieving a good description of the low-lying spectra. A notable feature of this approach is the close correspondence between the different sets of quartets used and the occurrence of well-defined band-like structures in the spectra of the studied systems.
Article
Astronomy & Astrophysics
K. Kaneko, N. Shimizu, T. Mizusaki, Y. Sun
Summary: Researchers have found that strong collectivity emerges suddenly in the mass-80 region in the nuclear chart. The inclusion of the 2d(5/2) orbit in the model space to cooperate with 1g(9/2) is identified as the key ingredient for describing the rapid increase of collectivity. The quadrupole-quadrupole interaction between quasi-SU(3) partner orbits is the driving force that changes the nuclear shape from oblate- to prolate-deformed.
Article
Physics, Nuclear
A. G. Serban, D. R. Nichita, D. Negrea, V. V. Baran
Summary: The study reveals the formal equivalence between the quartetting picture and the symmetry restored BCS picture for the ground state correlations induced by the general isovector-isoscalar pairing interaction. Multiple ground state structures compatible with particle number and isospin symmetries are evaluated, and the competition between isovector and isoscalar correlations is discussed in N=Z nuclei above Sn-100.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Physics, Nuclear
D. Negrea, N. Sandulescu, D. Gambacurta
Summary: This study analyzes the contribution of isovector and isoscalar proton-neutron pairing to the binding energies of even-even nuclei with N - Z = 0, 2, 4 and atomic mass 20 < A < 100. The binding energies are calculated using a mean-field approach coupled with a Skyrme-type functional and a zero-range isovector-isoscalar pairing force. The pairing force is treated in the framework of the quartet condensation model (QCM) which preserves particle number and isospin exactly. The interdependence of pairing and deformation is taken into account through self-consistent Skyrme-HF + QCM calculations in the intrinsic system. It is shown that the binding energies do not change significantly when the isoscalar pairing is activated, which can be attributed to the less attractive off-diagonal matrix elements of the isoscalar force and the competition between isoscalar and isovector pairing channels.
Article
Physics, Nuclear
S. A. Gillespie, J. Henderson, K. Abrahams, F. A. Ali, L. Atar, G. C. Ball, N. Bernier, S. S. Bhattcharjee, R. Caballero-Folch, M. Bowry, A. Chester, R. Coleman, T. Drake, E. Dunling, A. B. Garnsworthy, B. Greaves, G. F. Grinyer, G. Hackman, E. Kasanda, R. LaFleur, S. Masango, D. Muecher, C. Ngwetsheni, S. S. Ntshangase, B. Olaizola, J. N. Orce, T. Rockman, Y. Saito, L. Sexton, P. Siuryte, J. Smallcombe, J. K. Smith, C. E. Svensson, E. Timakova, R. Wadsworth, J. Williams, M. S. C. Winokan, C. Y. Wu, T. Zidar
Summary: This study aims to determine the electric quadrupole transition strengths and quadrupole moments of Kr-80 and Kr-82 through sub-barrier Coulomb excitation in order to better characterize their deformation. The comparison of measured values suggests that neutron-deficient isotopes of krypton are closer to axial deformation than other isotopic chains, and this trend may continue to higher proton numbers resulting in near-axial prolate deformation in Sr and Zr isotopes.
Article
Physics, Nuclear
H. T. Fortune
Summary: Two separate analyses of E2 strengths in the first and second bands of Sm-154 show consistent results, indicating small mixing that decreases with increasing J values.
Article
Astronomy & Astrophysics
G. Pasqualato, A. Gottardo, D. Mengonia, A. Goasduff, J. J. Valiente-Dobon, F. Nowacki, S. Peru, N. Pillet, G. de Angelis, S. D. Bakes, T. Bayram, D. Bazzacco, G. Benzoni, D. Brugnara, M. Cicerchia, P. Colovic, M. L. Cortes, A. Gadea, F. Galtarossa, M. Gorska, A. Gozzelino, E. Gregor, N. Hubbard, A. Illana, M. Jurado, S. M. Lenzi, G. Mantovani, T. Marchi, R. Menegazzo, A. Montaner-Piza, D. R. Napoli, F. Recchia, M. Siciliano, D. Testov, S. Szilner, I. Zanon
Summary: This work presents a new approach to the problem of B(E2) values in Sn isotopes, focusing on the Sn-100 nucleus. The measurement of low-lying excited states in odd-even Sn isotopes provides valuable information for understanding nuclear structure. In this study, lifetime measurements were performed in Sn-105 using the Recoil Distance Doppler Shift technique. The results were compared with theoretical calculations and showed the importance of proton excitation in the Sn-100 core. The B(E2) of the core-coupled state demonstrates an enhanced staggering compared to even-mass Sn-104 and Sn-106 isotopes.
Article
Physics, Nuclear
Priyanka Choudhary, Praveen C. Srivastava
Summary: In this study, newly developed microscopic effective sd-valence shell interactions are used to investigate the nuclear structural properties of sulphur, chlorine, and argon isotopes. The results reveal that the DJ16A interaction is the most suitable for sd-shell nuclei among the microscopic interactions. The study also provides predictions for quadrupole moments and demonstrates excellent agreement between magnetic moments and experimental values.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Biochemistry & Molecular Biology
Madhabi M. Bhanjadeo, Partha S. Nial, Chakkarai Sathyaseelan, Ajit K. Singh, Juhi Dutta, Thenmalarchelvi Rathinavelan, Umakanta Subudhi
Summary: The transition from right-handed to left-handed DNA not only plays a controlling role in gene expression switching but also has importance in nanomechanical device design. This study demonstrates that LaCl3 can induce controlled and reversible B-Z transition in short repeat sequences, providing insights into the molecular mechanism of this transition. The binding of LaCl3 to the phosphate backbone of Z-DNA is strong, resulting in the irreversible thermal melting of LaCl3-induced Z-DNA. These findings suggest that LaCl3 can be used as an inducer of left-handed DNA in other short oligonucleotide sequences.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Astronomy & Astrophysics
T. J. Gray, A. E. Stuchbery, J. Dobaczewski, A. Blazhev, H. A. Alshammari, L. J. Bignell, J. Bonnard, B. J. Coombes, J. T. H. Dowie, M. S. M. Gerathy, T. Kibedi, G. J. Lane, B. P. Mccormick, A. J. Mitchell, C. Nicholls, J. G. Pope, P. -g. Reinhard, N. J. Spinks, Y. Zhong
Summary: The g factors of 11/2(-) isomers in semimagic Sn-109 and Sn-111 were measured and found to be significantly lower than those of heavier isotopes, indicating a deviation from the theoretical expectation.
Article
Physics, Nuclear
P. C. Sood, R. Gowrishankar
Summary: The low-lying level structures of the neutron-rich transuranic Z=93 isotopes, 243Np and 244Np, were investigated to determine their ground states and identify any long-lived isomers. The ground state of 243Np was found to have a spin-parity (J pi) of 5/2-[523]. For the odd-odd nucleus 244Np, a two-quasiparticle rotor model was used to analyze the excitation energies of low-lying 2qp bands and rotational levels. The ground state of 244Np was determined to have J pi and 2qp configuration as 2+{p:5/2-[523](R) n:9/2-[734]}. The previously reported high-spin isomer (HSI) was confirmed to be an excited state with an energy of approximately 100 keV. The beta-decay branches of the isomer and the main beta branches to various levels in 244Pu were also briefly discussed.
Article
Physics, Nuclear
P. Petkov, C. Mueller-Gatermann
Summary: The formation of large size clusters and their relative motion are closely related to the origin of deformation in specific cases, such as the case of two doubly-magic clusters or two clusters with nearby characterization. New lifetime data in N = Z Sr-76 and Zr-80, along with data for neighboring N approximate to Z nuclei, consistently reproduce large B(E2) values, supporting the large-scale cluster approach.
Article
Physics, Multidisciplinary
M. Wang, Y. H. Zhang, X. Zhou, X. H. Zhou, H. S. Xu, M. L. Liu, J. G. Li, Y. F. Niu, W. J. Huang, Q. Yuan, S. Zhang, F. R. Xu, Yu. A. Litvinov, K. Blaum, Z. Meisel, R. F. Casten, R. B. Cakirli, R. J. Chen, H. Y. Deng, C. Y. Fu, W. W. Ge, H. F. Li, T. Liao, S. A. Litvinov, P. Shuai, J. Y. Shi, Y. N. Song, M. Z. Sun, Q. Wang, Y. M. Xing, X. Xu, X. L. Yan, J. C. Yang, Y. J. Yuan, Q. Zhang, M. Zhang
Summary: Using a new method of isochronous mass spectrometry, the masses of several isotopes are measured and redetermined with improved accuracy. These measurements reveal a bifurcation of the residual proton-neutron interactions in N = Z nuclei, which contradicts existing mass models and the expectations of symmetry restoration. Ab initio calculations with a three-nucleon force further indicate that this phenomenon is due to the enhancement of T =1 pn pairing over T = 0 pn pairing in this mass region.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Nuclear
P. Petkov, C. Mueller-Gatermann
Summary: The formation of large size clusters and their relative motion are closely related to the origin of deformation in specific cases, such as the case of two doubly-magic clusters or two clusters with nearby characterization. New lifetime data in N = Z Sr-76 and Zr-80, along with data for neighboring N approximate to Z nuclei, consistently reproduce large B(E2) values, supporting the large-scale cluster approach.
Article
Physics, Nuclear
M. Ciemala, S. Ziliani, F. C. L. Crespi, S. Leoni, B. Fornal, A. Maj, P. Bednarczyk, G. Benzoni, A. Bracco, C. Boiano, S. Bottoni, S. Brambilla, M. Bast, M. Beckers, T. Braunroth, F. Camera, N. Cieplicka-Orynczak, E. Clement, S. Coelli, O. Dorvaux, S. Erturk, G. De France, C. Fransen, A. Goldkuhle, J. Grebosz, M. N. Harakeh, L. W. Iskra, B. Jacquot, A. Karpov, M. Kicinska-Habior, Y. -H. Kim, M. Kmiecik, A. Lemasson, S. M. Lenzi, M. Lewitowicz, H. Li, I. Matea, K. Mazurek, C. Michelagnoli, M. Matejska-Minda, B. Million, C. Mueller-Gatermann, V. Nanal, P. Napiorkowski, D. R. Napoli, R. Palit, M. Rejmund, Ch. Schmitt, M. Stanoiu, I. Stefan, E. Vardaci, B. Wasilewska, O. Wieland, M. Zieblinski, M. Zielinska
Summary: A novel Monte Carlo technique has been developed to determine lifetimes of excited states in low-energy heavy-ion binary reactions, with validation in neutron-rich nuclei. The method relies on detailed analysis of Doppler-broadened gamma-ray lineshapes and utilizes gamma-tracking arrays for unprecedented position resolution.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Instruments & Instrumentation
C. R. Hoffman, T. L. Tang, M. Avila, Y. Ayyad, K. W. Brown, J. Chen, K. A. Chipps, H. Jayatissa, B. P. Kay, C. Muller-Gatermann, H. J. Ong, J. Song, G. L. Wilson
Summary: An in-flight beam of N-16 was produced via the single-neutron adding (d,p) reaction in inverse kinematics. The isomer fraction of N-16 at different reaction energies was determined, and the sensitivity to the angular acceptance of the recoils was observed.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Instruments & Instrumentation
P. Petkov, C. Mueller-Gatermann
Summary: New approaches for lifetime determination based on recoil distance Doppler-shift experiments are presented in this article. These approaches utilize the properties of functions describing the time evolution of excited nuclear states to improve the reliability and precision of the results. By using the maximum value and a purely numerical procedure, the new methods can accurately determine the ratio of lifetimes between consecutive levels and calculate unknown lifetimes. Additionally, integral derivation and the first moments of the functions are demonstrated to be useful in determining lifetimes.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Instruments & Instrumentation
M. Beckers, A. Dewald, C. Fransen, K. Arnswald, C. Mueller-Gatermann, F. von Spee
Summary: A new compact differential plunger device, the Cologne Compact Differential (CoCoDiff) plunger, has been developed and used in conjunction with various spectrometers and auxiliary detectors. The device was commissioned to measure the level lifetimes of the 2+1 and 4+1 excited states of 50Cr using the Differential Decay Curve method (DDCM). The experimental results obtained at the Cologne FN tandem accelerator using the reaction 24Mg(32S,4p2n)50Cr show good agreement with literature values.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Physics, Multidisciplinary
R. M. Perez-Vidal, A. Gadea, C. Domingo-Pardo, A. Gargano, J. J. Valiente-Dobon, E. Clement, A. Lemasson, L. Coraggio, M. Siciliano, S. Szilner, M. Bast, T. Braunroth, J. Collado, A. Corina, A. Dewald, M. Doncel, J. Dudouet, G. de France, C. Fransen, V Gonzalez, T. Huyuk, B. Jacquot, P. R. John, A. Jungclaus, Y. H. Kim, A. Korichi, M. Labiche, S. Lenzi, H. Li, J. Ljungvall, A. Lopez-Martens, D. Mengoni, C. Michelagnoli, C. Muller-Gatermann, D. R. Napoli, A. Navin, B. Quintana, D. Ramos, M. Rejmund, E. Sanchis, J. Simpson, O. Stezowski, D. Wilmsen, M. Zielinska, A. J. Boston, D. Barrientos, P. Bednarczyk, G. Benzoni, B. Birkenbach, H. C. Boston, A. Bracco, B. Cederwall, D. M. Cullen, F. Didierjean, J. Eberth, A. Gottardo, J. Goupil, L. J. Harkness-Brennan, H. Hess, D. S. Judson, A. Kaskas, W. Korten, S. Leoni, R. Menegazzo, B. Million, J. Nyberg, Zs Podolyak, A. Pullia, D. Ralet, F. Recchia, P. Reiter, K. Rezynkina, M. D. Salsac, M. Senyigit, D. Sohler, Ch Theisen, D. Verney
Summary: The reduced transition probabilities of certain nuclear states have been determined using a multinucleon transfer reaction, and the results have been interpreted using shell-model calculations. The findings suggest that seniority conservation is largely maintained in a specific orbital.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
S. A. Bennett, K. Garrett, D. K. Sharp, S. J. Freeman, A. G. Smith, T. J. Wright, B. P. Kay, T. L. Tang, I. A. Tolstukhin, Y. Ayyad, J. Chen, P. J. Davies, A. Dolan, L. P. Gaffney, A. Heinz, C. R. Hoffman, C. Muller-Gatermann, R. D. Page, G. L. Wilson
Summary: We present a novel technique for obtaining fission data for nuclei that are not in beta stability. These data are important for understanding the astrophysical r process, the origin of heavy elements, and developing predictive models for fission. They are also relevant for terrestrial applications in power generation and safeguarding. The solenoidal spectrometer technique, commonly used for studying nucleon-transfer reactions in inverse kinematics, has been successfully applied to deduce the fission-barrier height of 239U via the 238U(d, pf) reaction, confirming the validity of this technique.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Nuclear
Marcel Beckers, Claus Mueller-Gatermann, Konrad Arnswald, Thomas Braunroth, Alfred Dewald, Christoph Fransen, Alina Goldkuhle, Franziskus von Spee
Summary: A ? -? coincidence Recoil Distance Doppler Shift measurement was performed on Ni-60 to re-measure the lifetimes of the 2(1)(+) and 4(1)(+) states. The new lifetime of the 2(1)(+) state agrees with the adopted NNDC value but contradicts the results of recent Doppler-Shift Attenuation Method measurements, which indicated a longer lifetime. The new result for the 4(1)(+) state's lifetime is significantly shorter than the one recommended by the latest NNDC compilation, providing a resolution to the unexpected drop in transition strength from 58Ni to Ni-60. Both values are in good agreement with shell model calculations using the GXPF1A interaction.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Nuclear
X. Pereira-Lopez, M. A. Bentley, R. Wadsworth, P. Ruotsalainen, S. M. Lenzi, U. Forsberg, K. Auranen, A. Blazhev, B. Cederwall, T. Grahn, P. Greenlees, A. Illana, D. G. Jenkins, R. Julin, H. Jutila, S. Juutinen, X. Liu, R. Llewelyn, M. Luoma, K. Moschner, C. Mueller-Gatermann, B. S. Nara Singh, F. Nowacki, J. Ojala, J. Pakarinen, P. Papadakis, P. Rahkila, J. Romero, M. Sandzelius, J. Saren, H. Tann, S. Uthayakumaar, J. Uusitalo, J. G. Vega-Romero, J. M. Vilhena, R. Yajzey, W. Zhang, G. Zimba
Summary: A recoil-beta-tagging experiment was performed to study the excited T=0 and T=1 states in the Ag-94 nucleus, which is an odd-odd N=Z nucleus. The experiment used the MARA recoil separator and JUROGAM3 array at the University of Jyv & auml;skyl & auml;. Transitions between excited states in Ag-94 were identified by correlating fast beta decays with prompt gamma rays. The transitions were found to occur within and between the sets of states with T=0 and T=1.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Proceedings Paper
Physics, Multidisciplinary
G. Corbari, S. Bottoni, M. Ciemala, F. C. L. Crespi, S. Leoni, B. Fornal, R. V. F. Janssens, S. D. Pain, M. Siciliano, E. Albanese, A. D. Ayangeakaa, G. Benzoni, S. Carmichael, M. Carpenter, K. Chipps, N. Cieplicka, P. Copp, J. Forson, E. Gamba, L. W. Iskra, H. Jayatissa, F. Kondev, T. Lauritsen, B. Million, C. Mueller-Gatermann, A. Palmisano, M. Polettini, C. Porzio, W. Reviol, N. Sensharma, D. Seweryniak, C. Ummel, O. Wieland, G. Wilson, S. Zhu, S. Ziliani
Summary: In this study, a search for the ? decay of the 2(2)(+) near-threshold resonance in C-14 was conducted using the GRETINA ?-ray spectrometer coupled to ORRUBA Si detectors at the Argonne National Laboratory. The experiment had a sensitivity of approximately 2.6x10(-5), comparable to the predicted gamma branch calculated by the Shell Model Embedded in the Continuum. The results indicate a significant enhancement in the 2(2)(+) ? 0 transition probability as a result of the collectivization of the near-threshold state.
ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT
(2023)
Article
Physics, Nuclear
J. Chen, B. P. Kay, T. L. Tang, I. A. Tolstukhin, C. R. Hoffman, H. Li, P. Yin, X. Zhao, P. Maris, J. P. Vary, G. Li, J. L. Lou, M. L. Avila, Y. Ayyad, S. Bennett, D. Bazin, J. A. Clark, S. J. Freeman, H. Jayatissa, C. Muller-Gatermann, A. Munoz-Ramos, D. Santiago-Gonzalez, D. K. Sharp, A. H. Wuosmaa, C. X. Yuan
Summary: In this study, deuteron elastic scattering and inelastic scattering reactions to the first excited state of 15C were investigated using a radioactive beam of 15C in inverse kinematics. The analysis of the experimental data and comparison with theoretical calculations provided insights into the structure of 15C.
Article
Physics, Nuclear
A. Mattera, E. A. McCutchan, S. Zhu, C. Morse, M. P. Carpenter, P. Copp, C. Muller-Gatermann, W. Reviol, J. P. Greene, M. Gott
Summary: This study focuses on the identification and quantification of fission product 131I using the activation technique. The study successfully improved the uncertainty in intensity measurements and resolved discrepancies in literature values. Additionally, the study determined spin assignments for excited levels and mixing ratios for gamma-ray transitions using detailed angular correlation analysis.
Article
Physics, Nuclear
T. Huang, D. Seweryniak, B. B. Back, P. C. Bender, M. P. Carpenter, P. Chowdhury, R. M. Clark, P. A. Copp, X-T He, R. D. Herzberg, D. E. M. Hoff, H. Jayatissa, T. L. Khoo, F. G. Kondev, G. Morgan, C. Morse, A. Korichi, T. Lauritsen, C. Muller-Gatermann, D. H. Potterveld, W. Reviol, A. M. Rogers, S. Saha, G. Savard, K. Sharma, S. Stolze, S. Waniganeththi, G. L. Wilson, J. Wu, Y-F Xu, S. Zhu
Summary: The study investigated the products of the 203,205Tl(50Ti, 2n) fusion-evaporation reactions using the Argonne Gas-Filled Analyzer, discovering new single-proton Nilsson states in the previously unknown isotope 251Lr. Furthermore, a more detailed analysis of the alpha decay of 253Lr was conducted.
Article
Physics, Nuclear
V. Karayonchev, A. Blazhev, J. Jolie, A. Dewald, A. Esmaylzadeh, C. Fransen, G. Haefner, L. Knafla, C. Mueller-Gatermann, G. Rainovski, J. -m. Regis, K. Schomacker, P. Van Isacker
Summary: The lifetimes of low-energy states in the semimagic nucleus 211At were measured and compared to shell-model calculations. It was found that one of the calculations overestimated certain ground-state transition probabilities and underestimated the E2 strengths involving a specific state. However, modifying a matrix element in the calculation improved the agreement with experimental data significantly. The calculations in the single-j approximation showed good agreement with the measured transition probabilities, suggesting that seniority can be considered a good quantum number in 211At.
Article
Physics, Nuclear
L. Coraggio, N. Itaco, G. De Gregorio, A. Gargano, R. Mancino, F. Nowacki
Summary: In this study, the nuclear matrix element of the double-f3 decay of 100Mo, with and without the emission of two neutrinos, is calculated using the nuclear shell model. The computational problem posed by the exotic features of Mo isotopes is addressed by truncating the model space and introducing an effective approach. The predictivity of the calculation is supported by comparing the results with experimental data.
